Question

measurement topic 2: final exam
collecting and interpreting data
____ lt 2.2.1 identify the purpose of an investigation and/or the major concepts being investigated.
introduction: a solution is a mixture between a solvent (the substance that does the dissolving) and a solute (the substance that gets dissolved). in order for dissolving to take place, the solvent molecules must interact with the solute particles. there are several factors that affect the rate at which different particles dissolve: temperature, particle size and stirring.
during this lab investigation you will create several solutions of sugar - water by dissolving three different particle sizes of sugar (sugar cube, granulated sugar, and powdered sugar) into three different temperatures of water. you will then record the time it takes for each sample to dissolve the sugar. this data will then be used to determine the relationship between particle size, temperature, stirring, and dissolving time.
what is the purpose of the lab described above?
____ lt 2.2.2 select required materials, equipment, and/or conditions for conducting an experiment.
directions: for each of the following scenarios identify the most appropriate piece of lab equipment to use. you must get 4 out of 5 correct to earn credit for this learning target.
beaker
graduated cylinder
dropper pipette
erlenmeyer flask
stop watch
thermometer
conductivity probe
electronic balance
ruler
tongs
test tube
test tube clamp
hot hands
hot plate
bunsen burner
striker
2 identify the scientific tool you would use to measure each of the following.
a. ________ measure the time it takes for water to boil.
b. ________ hold a piece of copper metal in a bunsen burner flame.
c. ________ measure 32.0 grams of sodium bicarbonate.
d. ________ measure the dimensions (length, width, and height) of a rectangular solid.
e. ________ measure 12.0 ml (milliliters) of hydrogen peroxide.

Explanation:

1. Purpose of the Lab

The lab involves dissolving sugar in water under different conditions (particle size, temperature, stirring) and recording dissolution time. Its purpose is to investigate how particle size, temperature, and stirring affect the rate at which sugar dissolves in water.

A stopwatch is used to measure time intervals, so it's suitable for timing how long water takes to boil.

Tongs are used to hold objects, especially those that are hot or need to be placed in a flame, so they can hold the copper metal in the Bunsen burner flame.

Answer:

To determine the relationship between particle size, temperature, stirring, and the time it takes for sugar to dissolve in water (or to investigate factors affecting the rate of sugar dissolution in water).

2. Identifying Lab Equipment

A. Measure the time it takes for water to boil.